## What this PR does

Adds the cozystack-scheduler as an optional system package, vendored from
https://github.com/cozystack/cozystack-scheduler. The scheduler extends
the default kube-scheduler with SchedulingClass-aware affinity plugins,
allowing platform operators to define cluster-wide scheduling constraints
via a SchedulingClass CRD. Pods opt in via the
`scheduler.cozystack.io/scheduling-class` annotation.

The package includes:
- Helm chart with RBAC, ConfigMap, Deployment, and CRD
- PackageSource definition for the cozystack package system
- Optional inclusion in the platform system bundle

### Release note

```release-note
[cozystack-scheduler] Add cozystack-scheduler as an optional system
package. The custom scheduler supports SchedulingClass CRDs for
cluster-wide node affinity, pod affinity, and topology spread constraints.
```

Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>

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